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FIG. 1. Top view, Bacteriophage lambda vir plated on Escherichia coli strain WA921 using the LA top agar overlay method. The phage plaques appear as areas of clearing within the E. coli lawn. The lambda vir mutant produces clear plaques because it lacks the ability to follow the lysogenic path. Wild-type lambda plaques (not shown) would be cloudy because the phage is able to follow the lytic or lysogenic path. (Tong Lee and Maria P. MacWilliams, University of Wisconsin-Parkside, WI)
FIG. 2. Side view of the plate in Figure 1. Note the slight depression of the plaques with in the agar. (Tong Lee and Maria P. MacWilliams, University of Wisconsin-Parkside, WI)
FIG. 3. Top view. Bacteriophage M13mp18 derivative was plated on Escherichia coli strain XL1Blue using the LA top agar overlay method. Note the smaller size of the M13 "plaques" relative to the lambda plaques in the previous pictures. (Tong Lee and Maria P. MacWilliams, University of Wisconsin-Parkside, WI)
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